MailFixIt

Gmail SPF rejection

Gmail 550 5.7.24: The SPF record of the sending domain has one or more suspicious entries

Gmail can return this response when the sender domain has a suspicious or invalid SPF configuration. Inspect the exact envelope domain and current record before editing DNS.

Problem description

Gmail rejects or defers mail with an SPF-related response such as:

550 5.7.24 The SPF record of the sending domain has one or more suspicious entries.

Run this automated test on my domain

Enter your domain. MailFixIt checks the relevant DNS records automatically and shows the evidence.
Is this temporary or permanent?

A 550 response is permanent for that delivery attempt. A new delivery can succeed after the SPF path is corrected and DNS has propagated.

Why Gmail rejects this SPF path

Common causes include malformed mechanisms, more than one SPF record, broken include: targets, too many DNS lookups, and an envelope domain that does not authorize the real sending service.

Safe repair sequence

  1. Confirm the envelope MAIL FROM domain and actual sender.
  2. Read the current SPF record and every reachable dependency.
  3. Correct the specific syntax or dependency failure while preserving legitimate senders.
  4. Publish one effective SPF record and retest after DNS propagation.

Frequently asked questions

What should I check first for Gmail 550 5.7.24?

Identify the envelope MAIL FROM domain used by the rejected message, then inspect that domain’s one effective SPF record.

Should I create a second SPF record?

No. Multiple SPF records are invalid. Merge every legitimate sender into one reviewed record.

Related email diagnostics

Gmail 550 5.7.27: This message didn't pass SPF authenticationDiagnose Gmail 550 5.7.27 using the actual sending IP and envelope MAIL FROM domain, then correct only the SPF or sender path that failed. SPF terms after all are ignoredDiagnose SPF includes and redirects placed after all. Find unreachable sender authorization, reorder the policy safely, and verify the result. The SPF include or redirect target does not publish an SPF recordFind the exact SPF include or redirect target with no SPF policy. Diagnose a missing SPF dependency safely without removing legitimate sending services.

Primary sources: Gmail SMTP errors, RFC 7208 SPF.